I had a go at disconnecting my MAF sensor this morning on my way in. Something just doesn't feel right about my car, problem is I haven't driven another SClass to compare it with to know whether there is a problem or not… Its not running lumpy, starts fine and according to the computer returns around 31MPG after start on my run into work. BUT… Since its turned colder, it feels like the gearbox has changed to a lower ratio, its still quite smooth although whines a little when pulling away and shifting from 1-2, but has done since I have owned the car. If anything you could say that it feels "sportier" this sounds weird but it seems to pick up faster, stay in lower gear longer before shifting. On the motorway revs seem a little higher and it reminds me of how my previous car a Jaguar XJ8 Sport used to feel when you put the gearbox into Sport mode. De-acceleration, seems quicker as well, revs seem to drop off very quickly, all in all making the car feel a little less smooth than it did before. So I have done two things to try and sort this out. Firstly after reading the forums I tried some reset sequence that is supposed to reset the auto box ECU. Something like ignition on, accelerator to floor for 5 seconds, release gas and turn ignition off for 2 minutes. Didn't seem to do anything, not sure if it works on a W220. Then I disconnected the MAF. Car ran noticeably worse (and the Airmatic warning message came on when I first turned it on for some reason!), power was down and the car seemed to be "hunting" on de-acceleration, didn’t like it, so I connected it again after a couple of miles. Much better! Perhaps it seems strange that I am worrying about this, most people would probably pay good money for what feels like extra performance, but I don’t like it when things just happen of there own accord as it suggests that something is wrong. And I liked the rather sedate smoothness that I seemed to have before… Any ideas?